I'm trying to install 2 X300 cards in an HP DC7800 running XP Pro SP3 and after installing all the drivers for both cards I restart the machine and just before Windows loads the login screen the computer blue screens and shows a Hardware malfunction and that I have a memory parity error. If I remove either card and boot the computer with just 1 X300 card Windows boots just fine. I'm going to try completely removing all the software and drivers and reinstalling again.

Well I tried removing and reinstalling the software every which way and none of that worked. I've tried changing around the IRQ settings in the BIOs and that didn't help. I tried installing a different graphics card because I thought the memory error was being triggered by the 6 xtenda graphics drivers using the system RAM for video RAM and that didn't work. I'm currently doing a complete reinstall of Windows and i'll try installing the software and drivers before updating to SP3. This is getting ridiculous.

Update: Well reinstalling Windows did nothing I still get a Hardware Malfunction anytime I try to install the driver for the X300 graphics adapter. I've also tried updating the BIOS to the most current revision and playing around with the IRQ's once again and that didn't work. I'm completly out of ideas.

I just tried disabling all the USB ports in the BIOS and it still crashed. I then disabled the serial port and it still crashes. I tried uninstalling all the USB hubs and ports from within Windows Device Manager and it still crashes.

I think I figured it out apparently whenever I tried to install the drivers for the graphics adaptor it would use the old version instead of the newer driver that came along with the updated software. Once I manually told it to use the newer driver it installed fine. Unfortunately I didn't discover this until after I reinstalled Windows. I just hope it works when I hook it up to the 7 terminals.